Hey friends,

We're preparing for the mission "Inside Man" to continue the story of "Heart of the Empire". I noticed that the Mission Briefing notes that no Optional Deployments can be made until the Ambush Condition is reached. I checked the Rules Reference, and I believe that also extends to that the Imperial will not be able to reinforce Initial and Reserved Groups. Is that correct?

True. You can deploy groups and reinforce figures during optional deployments. The deploy/reinforce step is an optional deployment.